KDE Kiosk Mode
Although the Control Center menu items can be removed, it still is possible for users to control settings. Control Center restrictions can be set to ensure users cannot make many global system changes.
The following section in kdeglobals disallows users from accessing the respective control modules. A complete list of modules can be seen by using the kcmshell --list command:
... [KDE Control Module Restrictions][$i] kde-crypto.desktop=false kde-clock.desktop=false ...
KDE even provides the ability to restrict URLs entered into Konqueror or another program using KDE's internal URL libraries. To block URL access to a specific Web site, use the following in kdeglobals:
... [KDE URL Restrictions][$i] rule_count=n rule_1=open,,,,http,example.com,,false rule_2=open,,,,file,,/mnt/share,false rule_3=list,,,,file,,/mnt/cdrom,true ... rule_n=... ...
The format for the rules is: rule_N=<action>,<referrer protocol>,<referrer host>,<referrer path>,<URL protocol>,<URL host>,<URL path>,<enabled>. Any option that isn't listed explicitly matches all by default.
The first rule above restricts users from accessing the example.com Web site. The second rule blocks a user from opening or saving any file in the /mnt/share directory. The third rule blocks users from even seeing a list of files in the /mnt/cdrom directory.
The following rules prevent users from accessing a certain domain using http, forcing them to use https instead:
.. [KDE URL Restrictions][$i] rule_count=2 rule_1=open,,,,http!,*example.com,,false rule_2=open,,,,https,*example.com,,true ..
The URL Restriction convention is to match protocols of similar name, so a rule involving http would also encompass https. In the above example, http! is used to match only http and not https.
Recent work on automating the kiosk environment has led to the production of a Kiosk Admin Tool (see the on-line Resources). This program automates the administration of many of the advanced kiosk features KDE supports. The administrator can customize many of the items covered in this article using the Kiosk Admin Tool without the need for manual editing of the configuration files. The Kiosk Admin Tool also allows the administrator to create multiple kiosk profiles, maintain the profiles on a central machine and dispatch the configuration framework over a network with a protocol like SSH. Although the tool does not yet support every possible configuration value that could be customized, future versions are sure to add more configurability.
By using the advanced configuration features that KDE's Kiosk framework provides, the desktop experience can be completely customized. Whether it's administering multiple workstation configurations or simply providing a default configuration for new users, administrators have more than enough power at their fingertips to create the desired configuration result. This article barely begins to scratch the surface of possible configuration items. Experience and experimentation will provide more insight into all of the items available to create a customized desktop configuration.
Resources for this article: www.linuxjournal.com/article/7927.
Caleb Tennis is a design engineer with a small research and development company in Columbus, Indiana. He has been involved with many open-source projects, including KDE, Comedi and Gentoo Linux. When the weather cooperates, he likes to spend time rollerblading and wakeboarding, neither of which he is any good at.
Fast/Flexible Linux OS Recovery
On Demand Now
In this live one-hour webinar, learn how to enhance your existing backup strategies for complete disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible full-system recovery solution for UNIX and Linux systems.
Join Linux Journal's Shawn Powers and David Huffman, President/CEO, Storix, Inc.
Free to Linux Journal readers.Register Now!
|CentOS 6.8 Released||May 27, 2016|
|Secure Desktops with Qubes: Introduction||May 27, 2016|
|Chris Birchall's Re-Engineering Legacy Software (Manning Publications)||May 26, 2016|
|ServersCheck's Thermal Imaging Camera Sensor||May 25, 2016|
|Petros Koutoupis' RapidDisk||May 24, 2016|
|The Italian Army Switches to LibreOffice||May 23, 2016|
- Secure Desktops with Qubes: Introduction
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- CentOS 6.8 Released
- The Italian Army Switches to LibreOffice
- Linux Mint 18
- Chris Birchall's Re-Engineering Legacy Software (Manning Publications)
- ServersCheck's Thermal Imaging Camera Sensor
- Oracle vs. Google: Round 2
- Petros Koutoupis' RapidDisk
- The FBI and the Mozilla Foundation Lock Horns over Known Security Hole
Until recently, IBM’s Power Platform was looked upon as being the system that hosted IBM’s flavor of UNIX and proprietary operating system called IBM i. These servers often are found in medium-size businesses running ERP, CRM and financials for on-premise customers. By enabling the Power platform to run the Linux OS, IBM now has positioned Power to be the platform of choice for those already running Linux that are facing scalability issues, especially customers looking at analytics, big data or cloud computing.
￼Running Linux on IBM’s Power hardware offers some obvious benefits, including improved processing speed and memory bandwidth, inherent security, and simpler deployment and management. But if you look beyond the impressive architecture, you’ll also find an open ecosystem that has given rise to a strong, innovative community, as well as an inventory of system and network management applications that really help leverage the benefits offered by running Linux on Power.Get the Guide